A lava rose is a rare drip formation found on floors, with a rose-like appearance. It is a form of drip stalagmite, but instead of driblets, sheets of molten lava fall. Roses may also form, instead, from upwelled lava boiling up out of a partially solidified floor. Boiling of cooling (segregated) lava is probably what propels the upwelling.
AUTHOR: Dave Bunnell